Fuse-plug puller



H. D. GRINNELL May 22, 1923.

FUSE PLUG FULLER Filed March 3. 1922 mwew. v.-

Patented 'li/'lay 222, i923.

*UNTELSTES HAROLD D. GRINNELL, OF PITTSFIEKLO, MASSACHUSETTS, ASSIGNOR T0 THE G. A.. i

restais MANUFACTURNG COMPANY, OF BITTSFIELDI/IAS'SACHUSETTS, A. CORPORATION OF MASSACHUSETTS.

russ-:PLUG FULLER.

Application filed March 3, 1922. Serial' No. 549,770.

' To all whom t may concern Be it known that l, HAROLD D. GRI'NNELL, a citizen of the United States, and a resident of Pittsfield, in the county of Berkshire and State of Massachusetts, have invented an improvement in Fuse-Plug Pullers, of which the following` description, in connection with the accompanying drawings, is a specification, like characters" on the drawings representing like parts.

This invention yrelates to v apparatus for removing and replacing electric fuse plugs and other objects, and aims to providel novel and improved means for manually performing t-hese operations quickly and safely, and particularly in respect to fuse plugs arranged in elevated positions. n

My invention will best be yunderstood from a description of a specific useful embodiment thereof, illustrated in the accompanying drawings, wherein, 1

Fig. l is a Side elevation of the device inoperative relation to an approved type of fuse plug, the lower portion of the rod or handle of the device being cut away;

Fig. 2, a longitudinal vertical section of the same on an axial plane, the device being rotated 90 to the left and operatively engaging a modified type of fuse plug;

Fig. 3, a detail inner face view. of one of the clamping members; and

Fig. t, a face View of the lever controlling the clutch actuating means.

Referring to the accompanying drawings, the device is shown as comprising a clutch portion and a supporting portion. rlhe lsupporting portion, upon which the clutch portion is movably mounted for adjustment with respect to the object to be moved, is

shown in the form of a rod or handle 9 ofindeiinite `and variable length for enabling the operator to conveniently manipulate the object when placed beyond his ggrasp. This handle may be formed in any manner suitable to the purpose, and if preferably composed of a series of sections detachably connected s0 that by adding or removing a suitable number vthe aggregate length of the handle may be readily accommodated to the required reach for operation. As herein shown, the handle comprises a permanent terminal section 10, upon one end. of which is mounted the clutch portioinfwhile theopposite-end is connected to vone or more similar detachable sections, illustrated at 11,

suitable registering openings in the'4 walls of the overlapping portions ofthe bushings 12,13.`

rlhe clutch portion of my device including suitable control means therefor, is

mounted rod 9.

As herein shown, this portion comprises a series of adjustable lingers or clamps 15 of any convenient size or number pivotally secured near their lower ends to a support,

on the upper extremity of the such as the plate 16 carried on the exv tremity of the rod 9, and extending upward beyond the rod to providezgripping members adapted to be moved into and out of a gripping position. The supporting plate 16,v which yis preferably vsecured vin a horizontal position'and in rigid relation to the rod 9 by a screw17 extending through a suitable central opening in the plate and extending well down into the rod, is provided on its outer margin with a series of radial ears 18, 18 arranged in pairs, each pair supporting a pin 19upon which one of the clamps lis pivoted to swing toward and away from the axis lof the rod. The

' upper ends of the clamps lare designed as l While the latter may vary in structuralv detail, as shown in the modification 12() illustrated in Fig. 2, according to the fuse plug setting and source of manufacture, the accepted types ofvfuse plugs in commonv use carry a knob orhandle connected vto thel body of the plug by a more or less reduced neck portion 22. This knob 2O may be provided with marginaly devices such as serrations or recesses 23, 23 to cooperate with the means employed for its removal.

In normal position the clamps 15 are inclinedl lengthwise converging'toward theirl outer ends, v'which arereduced -in'thickiness and expanded laterally, assuminga *concavo-convex or spoon-like formation.v The inner or concaveface of each of said outer tions (notshown) provided on the engaged endsfisfprovided centrally withv aboss 24 and an aperture 25, arranged on `each side thereof, the object or the boss being to take into hollow-"or groove 'A ori-.the engaged port-ieri off the knob"`2O,"such"groove or hol-Y low being illustrated by the 'recesses 28 in ythe type shown in Fig. 1, and by the annular channel surroundingfthe neclrl 1.22, illustrated iny Fig. 2, While the apertures 25 are desiOned to receive teethl or other nro ecportion o'fmod-iiied .typesoi fuse handles.

Each-.of the .clamps is v...tended down ward beyond the point of pivotal support to' forma. V't'oot26 which normally engages the outer surface of icone-shapedthrustv mem- .ber 27, operating to 'control the movements x of the 'clamps. I

yielding contact with the thrust. member 27 Saidteet 26 are held in preferably lby means of coil springs 28 carried on radially arranged studs 29 provided on a. ring 8O secured centrally'to the plate v16, cachot said springs being seated in a suitable recess 31 provided on the inner face-of the body-portion ot each of the clamps laat-,a pointopposite the corresponding stud l29. SaidV springs 28l thus operate to `spread the clamps 15 when. the superior force normally operating to converge the. clamps isl relaxed. The vring 30 is interiorly provided at its lower end with an lannular-inclined shoulder 32 forming a seat for thel screw 17, which serves vto .secure the .ring in fixed positionon the plate 16.

The thrust member 27, which operates to throw .the clamps 15 into vthe clamping pov sition, is shown in the former a metal sleeve mounted upon the rod 9 below the terminaly plate '16 and arrangedto move into and out of engagement with, the feet 26. This thrust member isntorced upward and held ncrmally in elevated position onithe rodv 9 byy rmeansof a-cloilfeXpansion mainspring 33 surrounding. the handle immediately below the thrust member, thusspreading the feet 26. The upper end of said niainspring 33 e2;-

tends kinto a bore 3d provided inthe lower l' end of the thrust member, and 4having a ber are controlled by a lever 36 disposed .-inangular relation to the rod 9 and pivotally attached, thereto at one end. As

shown, the lever 36` has a yoke-,like `or U.

l' shaped :formation adapted to freely. straddle ftherod 9, the inner ends of the4 lever being l 60 laterally: provided on thefcollar 35, while suitablyfpivoted-to apertured lugsy 37, 37

the outer lor curved endof the lever isvpro-y jected inthe opposite direction to wpont well.beyond `the rod, being provided with an Y T5' aperture 38'toreceve a flexible pull-cord 39 f Iof indeh'nite lengthl suspendedtherefrom, said pull-cord being extended downward to a convenient point within the grasp or' the operator. n Movable connection between the thrust member-27' and lever 361s 'established by means ol the bar linkse()- arranged in parallel on opposite sides of the rodl 9, said links being aivotally attached at their upper ends to` studs 41 provided on the lowerv rim of the thrust member 27 and also piv-y otally connected at ytheir lowerj ends to Lthe lever 86 at vpoints lpreterably adjacent its pivoted ends. K

The lever-36 normally assumes an upward inclination, being heldin this position while at rest underthe force of the mainspring 33 acting through the medium ofthe thrust member 27 and bar links LO. To vspread .the

clamps for the purpose` of releasing or at` taching my device withrespect to a' fuseplug, the position' ofthe thrustmember 27 is reversed or retracted by means of the pullcord 39, thereby permittingthe reflex coil springs 28 controlling the action-or the' individual clamps to operate in the manner before described.

The Jfuse plugvshown in Fig. '1 belongs to 'that type of plugs wherein 'it is necessaryto supplement a straight pulling or pushing action by a rotary'motion, while the type indicated in Fig. 2 requires no lrotary'motion to install it. Hence it will be apparent that my device is'designed to be applied in `practice toobjects varying in structuralvdetail and method ofA attachment, including both the screw and pull types offsetting. My invention is obviously not'restricted to thel particular embodiment yherein shownv and described.

` I claim as my invention:

v 1. In a device ofthe classdescribed,a support, and afseries of clamping armspivoted to the support and having, jaw portions adapted to'be moved into and out of cooperative relationship, each of ksaid jaw portions having a concavegripping JfaceV and `a rigidly acting'y extension member on saidv `face adapted to cooperate with the object engaged to prevent rotation on such object.

2. In a ,device of the 'class described, Va support, and afseries of clamping arms pivotally securedtothe support and having jaw yportions adaptedto be moved'into'and `out of cooperative relationship, each otsaid j aw p portions having arconcave gripping face and atransverse opening therethrough for re-l ceiving yan extension member ionv the object engaged to prevent` rotation on such'object. 3. Adeviceof the class described adapted for application lengthwisefin the direction of the axial linel of the obj ect to .be @moved and comprising, coinbinatioma Vlorigitudinal support, clamping arms prvotallyfsefctired v to the support and havingy their" gripping ends adapted to be moved intoand out of co-` operative relationship, a member mounted to slide on the support and spring means cooperating therewith for throwing the arms into the gripping position, retraction means 5 therefor, and means for spreading the clamping arms at their gripping ends, each of the clamping arms having a concave gripping face with rigidly a-cting means thereon adapted to cooperate with the object to-be moved to prevent relative movement in turning, drawing or pushing the object.

4. In a device of the class described,in

combination, a support, a series of clamping i arms pivotally secured to the support, each of said clamping arms being extended on opposite sides of said point of support, a sliding member carried on the support and adapted to be moved into and out of position for spreading the lower ends of saidy 30 ycnd the point of support, means for throwing the arms into the gripping position, and separate means for spreading said armsand including an extension member carried on said end of the rod and spring means carried by said extension member and operating to impel said arms away from said extension member. ,s

6. In a device of theV class described, Vin combination, a support, a series of clamping arms pivotally secured to the support and having jaw portions adapted to be moved into and out of lcooperative relationship, said jaw portions having uneven gripping faces providing parallel spaced channels surrounding the axis of said support, means for throwing the arms into the gripping position, and separate means for spreading said aw portions.

7. In a device of the class described, in combination, a support 9, clamping arms l5 mounted on the support and having concave jaws, an extension member 24 on the inner face of each of the jaws, a spring 33 for actuating the arms into the gripping position, and separate springs 28 for spreading the arms.

In testimony whereof, l have signed my name to this specification.

HAROLD D. GRIN NELL. 

